I don’t know that it ever qualified as a “best seller,” but when I’ve talked with friends my age about an “Adventist” book that stood out for them as they grew up, again and again people said the novel Roommates, by the-then Trudy J. Morgan.
This is a companion discussion topic for the original entry at https://spectrummagazine.org/arts-essays/2019/wandering-and-wondering-prone-wander-hits-home